Telegraph sounder



C. H. TEEGAHDEN. TELEGRAPH SOUNDER. APPLlATloN HLED SEPT. 25. wie.

l ,406 y128. Patented Feb. 14, 1922.

NTE@ STATES earner carica.

TELEGRAPH SQUNDER.

incense.

Specification of Letters Patent. Patented Febb. 1%, 11922.,

Application filed September 25, 1918. Serial No. 255,609.

To all lwhom t may concern:

Be it known that l, CHESTER l-l. TnnGAn- DEN, a citizen of the United States, and a residenty of Washington, in the District of Columbia, have invented certain new and useful- Improvements in Telegraph Sounders, of which the following is a specification.

My invention relates to telegraph Sounders and in particular to that type of sounder which is mounted in the type of casing commonly referred to as a watch-casing. A principal object of my invention is the provision of such a sounder so designed that all'adjustments may be made from the exterior of the casing. Another object of my invention is the provision vof polarizing means in such a sounder. A further obj ect ofmy invention is the provision of a sounder of this type so wound and so provided with terminals that it may be used for either a straight sounder or a differential sounder.' l' find my lsounder of particular use in connection with my method of receiving telegraph signals which l have described in copending application, Serial No. 253,309, filed September 9, 1918, (Case B). I attain my objects by means of the construction herein described, which construction is the preferred embodiment of my invention.

In the drawing, Figure 1 represents a perspective view ofmy sounder showing the parts thereof separated but in proper order in relation to each other; Figure 2 is a plan view of my sounder with the cover and diaphragm removed; Figure 3 is a section of my sounder on the line 3-3 of Figure 2; and Figure f1 is a section onthe line lmlof Figure 2. For a more detailed explanationY of the preferred embodiment `of my yinvention reference is made of the following description.

' My sounder consists of a casing 1 formed of suitable material preferably insulation and provided with screw threads 2 by means of which a cap 3 is secured to the open end thereof. This cap and casing are of the type normally used for telephone head sets and designated as watch-case receivers.' The cover 3 accordingly has a hole L1, and in order to cover this hole and prevent the entrance of foreign material into thecasing the ordinary diaphragm 5 is retained in itsy position to cover the open end of casing 1 and is clamped in this position by the cover 3. The casing is supported bymeans of a metallic band 6 secured to it by means of pivots 7 and this band in turn is supported by means of head strap 8 secured thereto. This means of support and this casing are the ordinary casing and means of support for a head telephone. ln carrying out my invention l have removed the telephone mechanism from this casing and substituted therefor my improved and novel sounder.

This sounder consists essentially of a permanent magnet 9 of such size and shape as to lit within the casing and to subtend some three fourths of the periphery thereof. This magnet is secured to the casing by means of a bolt 34: passing through a hole 35 in the magnet and a hole 36 in the casing 1. Secured to one face of this permanent magnet 9 by means of bolts 37 are two magnetizable strips 10 and 11, extending toward each other and toward the center of the casing. V hen still a short distance from each other these strips are bent inwardly to extend parallel to each other and axially of the casing. These strips are held in the casing 1 by means of screws 38 threaded into the strips and inserted therein through holes 39 in the bacl: of the casing 1. 11 are rigidly connected to magnet 9 through bolts 37, the screws 38 aid in holding the magnet 9 in place. Upon the upstanding port-ions of these pole pieces are wound coils 12 and 12 and 13 and 13', and the pole pieces Vare so positioned that these coils abut each other along the center line of the sounder. The coils 12 and 13 are connected in series and provided with terminals 14 and 16, while the coils 12 and 13 are similarly connected and provided with similar terminals 15 and 17. These terminals are all suitably mounted on a projection 13 of the casing 1. Secured to the upper edge of the. permanent magnet 9 is a brass annulus 19, to which is pivoted, by means of brackets 20, an armature 21 so formed as to bridge the terminals 22 and 23 of the pole pieces 10 and 11. This armature is held in to retracted position by means of a spring 24 carried by the armature on its under side and engaging an adjusting screw 25 provided with a handle 33 and acting in a nut 26 secured to the casing 1. The movement of the armature is limited by a tip of the armature plays. The stop 23 is screw threaded externally and internally. rllhe external threads engage with Va nut 29 secured to the casing 1, while the internal threads engage the external threads on the shaft 30 of the stop 27. The stops 27 and 28 Since the strips 10 and f Y .pair of stops 27 and 28 between which the are provided with milled operating handles 3l and 32 respectively.

Under normal conditions (when no current is flowing in either coil 12 or I3) the permanent magnet 9 will act to attract the armature 2l. This action is opposed b y the spring 2e' and the position'ot the armature will depend upon the tension of this spring 2d. Should the spring 24 be adjusted'so that it is comparatively weak the armature 2l will be normally attracted and will only be retracted when a current flows through the coils l2 and 13 in such direction as to oppose the attraction of the magnet 9 and in such strength as to overcome such attraction. the tension is comparatively great the per manent magnet 9 will be inelt'ective and the armature will be normally retracted. Under such conditions it will be attracted through the action of the coils l2 and 13. There is however an intermediate tension of spring 24 in which it is not suflicient to retract the armature 21 from its attracted position but is suiiicent to prevent attracton of the armature due to the force exerted upon it by the permanent magnet `9. It will be apparent that, due to this adjustability, the armature will operate upon the occurrence ot current or upon cessation of current or will move from one position to another with eachV It will Vbe apparentV reverse ot' current. further that inasmuch as Vthe 'adjusting handle efcontrolling the tension of this spring 24 has been positioned 'exteriorly of the easing l, I may change my sounder from one type to the other while it is in operative position upon the head. .The advantage of this will beappreciated by those skilled in the art.

It will be apparent from the above description that I have provided a sounder of the watch-case type which is polarized; that I have provided adjustments for this sounder whereby it may be converted into Vvarious types; that these adjustments may all be made from the exterior of the casing while the sounder is in operative position; and that I have provided such a sounder with two independent coils whereby it may be used to respond to one current or to the sum or difference of two independent ourrents.

It will be apparent that the exact type of casing` herein described is not essential, the A object of the useV of this type of casing being to secure a casing of a standardtype which may be conveniently adjusted to the ear and secured to the head. It will also be apparent that it is not necessary for the polarized magnet 9 to be a permanent magnet but that under proper conditions this magnet might be an electro-magnet. A

It will further be apparent that While I have described with great particulari'ty the Should the adjustment be such that' preferred embodiment of my invention as illustrated in the` drawing, various modifications ot greater or smaller degree may be made in the structure of my sounder and still permit the sounder to fulfill the objects ot my invention. In so far as these modifications and changes are covered by theap pended claims, I deem them to be a part of my invention and claimed by me as such.

I claim: Y

=l. In a sounder, a casing of the watch case type, a horseshoe shaped permanent magnet therein, two pole pieces for said magnet eX- tending toward each other, extensions of said pole pieces extending from the ends of said pole pieces at right angles to said pole pieces, a coil wound on each of said eXtensions, the two said coils being distinct vfrom each other, an armature pivoted to bridge the Vends of said extensions, 'a spring acting to retract said armature, an adjusting screw for said spring operable from without said casing, and a pair of stops, for limiting the movement of said armature, and operable 'from without said casing. v

2. In a sounder, a casing, an armature carried by the easing, electromagnetic means for exertingy varying impulses upon the Yao , armature, yieldable means tending to retract the armature Yinto a given position,`means by which the effect of the said yieldable means may be regulated, stop means for limiting Vthe extent of movement of the armature, and means by which the limits of movement of the armature may be shifted independently, said two limiting means being movable independently of each other.

3. In a sounder,v thecombination of electromagnetic means, an armature for said electromagnetic means and stop means for limitingthe extent of movement of said armature including a rod, a stop supported by said rod and a second stop adjustably mounted on said rod.

4c. In a sounder, the combination with a 110 casing of electromagnetic means, an armature for said electromagnetiemeans, and

stop means-for limiting the extent of movement of said armature including a rod eK` tending eXteriorly and operable exteriorly of said casing, a stop supported by said rod and a second stop adjustably mounted on the said rod Vand operable Yexteriorly of said casing. Y

5. In a sounder, the combination with a casing, ofrelectromagnetic means mounted therein, an armature'for said electromagnetic means and stop means for limiting the extent of movement of said armature including a rod mounted in and extending exteriorly of said casing, a stop in fixed relation to said rodand a second stop adjustably mounted on said rod.

In a. sounder, the combination with a casing, ot Vele'ctromagnetic means mounted 130 therein, an armature for said electromagnetic means and stop means for limiting the extent of movement of said armature including a threaded rod in threaded relation With and extending exteriorly of said easing, said rod being operable from the exterior of said easing, a stop supported by said rod and f.- seeond stop in threaded relation with said rod.

7. In a sounder, the combination of a casing, electromagnetic means therein, an armature or said means, and stop means for limiting the extent of movement of said n testimon whereof I aix my signature.

CHSTER H. TEEGARDEN. 

